By Daniel Bates It’s officially Case Keenum’s show in Houston this week. Per Ari Meirov, the Texans will start veteran backup Case Keenum in Sunday’s game against the Tennessee Titans instead of Davis Mills while C.J. Stroud continues to recover from a concussion. Fans reacted to the news on Twitter. “CASE KEENUM LEGACY GAME,” a user posted. “Flacco, Lock, Keenum, Rypien … Teddy and Trevor Siemian need to get a start this season to continue the trend of former starting Broncos quarterbacks somehow starting a game in 2023,” another replied. “It’s actually pronounced Keesum,” Brandon Perna com…